U

undirected graph, 60

modeling real-world problems, 61

Unicode characters, possible values of, 74

Unicode character type in Java and C#, 71

Unicode strings, code needed to process, 75–76

union types, 155

UNKNOWN value, 141

unpaired factors, numbers with, 164

unsigned integer, reading a value as, 156

unsorted lists, detecting, 93

user interfaces, coding, 1

user threads

described, 108

versus system threads, 108–109